William Allerdice born 1821 in Glasgow

William Allerdice (b.1821 in Glasgow) married Isabella King (b. 1824) in Cambuslang, Glasgow, Scotland on 17 Nov 1843.Their daughter, Catherine, was born 22 Sept 1844 in Glasgow.William, Isabella & Catherine, along with John Allerdice (age 12) and Catherine Young, sailed to New York aboard the sailing vessel, Tuskiner, landing in Sept 1848.Isabella, John Allerdice, and Catherine Young died in Boston during the first winter.Who were William Allerdice's parents?